HPV vaccine effectiveness against prevalent HPV by age, years sexually active before vaccination, and HIV status in gay, bisexual, and other men who have sex with men, 2019-2021.
BACKGROUND We compared the prevalence of vaccine-preventable anal human papillomavirus (HPV) types among gay, bisexual, and other men who have sex with men (GBM) living in large cities in Canada from 2019 to 2021 by age and HIV status. METHODS Sexually-active GBM ≥16 years were recruited in Montreal, Toronto, and Van...